Particle Motions in a Gas-Fluidized Bed of Sand | Zendy

Narayanan Me | Zendy; D. J. Durian | Zendy

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Particle Motions in a Gas-Fluidized Bed of Sand

Author(s) -

Narayanan Me,

D. J. Durian

Publication year - 1997

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.79.3407

Subject(s) - fluidized bed , particle (ecology) , mechanics , dissipation , granular material , fluidization , magnetosphere particle motion , materials science , physics , classical mechanics , thermodynamics , geology , composite material , magnetic field , oceanography , quantum mechanics

We report measurements by diffusing-wave spectroscopy of particle motions in a gas-fluidized bed. The homogenous state of the bed known as the uniformly fluidized state is actually a weak solid in which particles are at rest. The only truly fluid state is an inhomogenous mixture of gas bubbles and of liquid regions in which microscopic particle dynamics are shown to be collisional. The motion of macroscopic bubbles is the source of particle motions in the bed. Measurements of mean free paths, collision rates, and velocity fluctuations (the ``granular temperature'') show that dissipation occurs nonuniformly in the medium.

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